/*
 * Copyright [2013-2021], Alibaba Group Holding Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.alibaba.polardbx.common.utils.thread;

import java.lang.management.ManagementFactory;
import java.lang.management.ThreadMXBean;

public class ThreadCpuStatUtil {

    public static int NUM_CORES = Runtime.getRuntime().availableProcessors();

    public static ThreadMXBean THREAD_MX_BEAN = ManagementFactory.getThreadMXBean();

    static {
        if (System.getenv("cpu_cores") != null) {
            try {
                NUM_CORES = Integer.parseInt(System.getenv("cpu_cores"));
            } catch (Throwable ignored) {
            }
        }
    }

    public static long getThreadCpuTimeNano() {
        return THREAD_MX_BEAN.getCurrentThreadCpuTime();
    }
}
